/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -data @noDefault -ultimatedata ./data --traceabstraction.trace.refinement.strategy FIXED_PREFERENCES --traceabstraction.compute.interpolants.along.a.counterexample FPandBPonlyIfFpWasNotPerfect -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.assert.codeblocks SMT_FEATURE_HEURISTIC --traceabstraction.assert.codeblocks.term.scoring.heuristic NUM_FUNCTIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.partitioning.strategy FIXED_NUM_PARTITIONS --traceabstraction.assert.codeblocks.term.scoring.heuristic.number.of.partitions 2 -s ../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf -i ../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c -------------------------------------------------------------------------------- This is Ultimate 0.1.25-d623d84 [2020-07-21 14:02:32,501 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-07-21 14:02:32,504 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-07-21 14:02:32,524 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-07-21 14:02:32,524 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-07-21 14:02:32,526 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-07-21 14:02:32,528 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-07-21 14:02:32,539 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-07-21 14:02:32,544 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-07-21 14:02:32,548 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-07-21 14:02:32,549 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-07-21 14:02:32,550 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-07-21 14:02:32,551 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-07-21 14:02:32,552 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-07-21 14:02:32,554 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-07-21 14:02:32,556 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-07-21 14:02:32,558 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-07-21 14:02:32,559 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-07-21 14:02:32,560 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-07-21 14:02:32,566 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-07-21 14:02:32,572 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-07-21 14:02:32,575 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-07-21 14:02:32,576 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-07-21 14:02:32,578 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-07-21 14:02:32,580 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-07-21 14:02:32,587 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-07-21 14:02:32,588 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-07-21 14:02:32,589 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-07-21 14:02:32,589 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/default/automizer/svcomp-Reach-32bit-Automizer_Default.epf [2020-07-21 14:02:32,604 INFO L113 SettingsManager]: Loading preferences was successful [2020-07-21 14:02:32,605 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-07-21 14:02:32,606 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2020-07-21 14:02:32,607 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2020-07-21 14:02:32,607 INFO L138 SettingsManager]: * Use SBE=true [2020-07-21 14:02:32,607 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-07-21 14:02:32,607 INFO L138 SettingsManager]: * sizeof long=4 [2020-07-21 14:02:32,608 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-07-21 14:02:32,608 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-07-21 14:02:32,608 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-07-21 14:02:32,608 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-07-21 14:02:32,608 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-07-21 14:02:32,608 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-07-21 14:02:32,609 INFO L138 SettingsManager]: * sizeof long double=12 [2020-07-21 14:02:32,609 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-07-21 14:02:32,609 INFO L138 SettingsManager]: * Use constant arrays=true [2020-07-21 14:02:32,609 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-07-21 14:02:32,610 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-07-21 14:02:32,610 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2020-07-21 14:02:32,610 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-07-21 14:02:32,610 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-07-21 14:02:32,611 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 14:02:32,611 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-07-21 14:02:32,611 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2020-07-21 14:02:32,611 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2020-07-21 14:02:32,612 INFO L138 SettingsManager]: * Trace refinement strategy=CAMEL [2020-07-21 14:02:32,612 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:32,612 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-07-21 14:02:32,612 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2020-07-21 14:02:32,612 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Trace refinement strategy -> FIXED_PREFERENCES Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> FPandBPonlyIfFpWasNotPerfect Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks -> SMT_FEATURE_HEURISTIC Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic -> NUM_FUNCTIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic Partitioning Strategy -> FIXED_NUM_PARTITIONS Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Assert CodeBlocks Term Scoring Heuristic number of partitions -> 2 [2020-07-21 14:02:32,904 INFO L81 nceAwareModelManager]: Repository-Root is: /tmp [2020-07-21 14:02:32,926 INFO L258 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-07-21 14:02:32,930 INFO L214 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-07-21 14:02:32,934 INFO L271 PluginConnector]: Initializing CDTParser... [2020-07-21 14:02:32,934 INFO L275 PluginConnector]: CDTParser initialized [2020-07-21 14:02:32,936 INFO L429 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-07-21 14:02:33,003 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c5ba4ab17/1e95ba7c49de420093a4daac9747e6bf/FLAGe614b7061 [2020-07-21 14:02:33,468 INFO L306 CDTParser]: Found 1 translation units. [2020-07-21 14:02:33,469 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/loop-acceleration/simple_4-2.c [2020-07-21 14:02:33,475 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c5ba4ab17/1e95ba7c49de420093a4daac9747e6bf/FLAGe614b7061 [2020-07-21 14:02:33,884 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/c5ba4ab17/1e95ba7c49de420093a4daac9747e6bf [2020-07-21 14:02:33,896 INFO L296 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-07-21 14:02:33,899 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-07-21 14:02:33,900 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-07-21 14:02:33,901 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-07-21 14:02:33,905 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-07-21 14:02:33,906 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:02:33" (1/1) ... [2020-07-21 14:02:33,909 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@703f0828 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:33, skipping insertion in model container [2020-07-21 14:02:33,910 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.07 02:02:33" (1/1) ... [2020-07-21 14:02:33,919 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-07-21 14:02:33,937 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-07-21 14:02:34,121 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:02:34,125 INFO L203 MainTranslator]: Completed pre-run [2020-07-21 14:02:34,137 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-07-21 14:02:34,149 INFO L208 MainTranslator]: Completed translation [2020-07-21 14:02:34,150 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:34 WrapperNode [2020-07-21 14:02:34,150 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-07-21 14:02:34,151 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-07-21 14:02:34,151 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-07-21 14:02:34,151 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-07-21 14:02:34,161 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:34" (1/1) ... [2020-07-21 14:02:34,162 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:34" (1/1) ... [2020-07-21 14:02:34,166 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:34" (1/1) ... [2020-07-21 14:02:34,167 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:34" (1/1) ... [2020-07-21 14:02:34,248 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:34" (1/1) ... [2020-07-21 14:02:34,253 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:34" (1/1) ... [2020-07-21 14:02:34,254 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:34" (1/1) ... [2020-07-21 14:02:34,255 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-07-21 14:02:34,256 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-07-21 14:02:34,256 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-07-21 14:02:34,257 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-07-21 14:02:34,262 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:34" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-07-21 14:02:34,323 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-07-21 14:02:34,323 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-07-21 14:02:34,323 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2020-07-21 14:02:34,323 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-07-21 14:02:34,323 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_error [2020-07-21 14:02:34,324 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2020-07-21 14:02:34,324 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-07-21 14:02:34,324 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-07-21 14:02:34,324 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-07-21 14:02:34,487 INFO L290 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-07-21 14:02:34,487 INFO L295 CfgBuilder]: Removed 1 assume(true) statements. [2020-07-21 14:02:34,491 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:02:34 BoogieIcfgContainer [2020-07-21 14:02:34,491 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-07-21 14:02:34,492 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-07-21 14:02:34,492 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-07-21 14:02:34,495 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-07-21 14:02:34,496 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.07 02:02:33" (1/3) ... [2020-07-21 14:02:34,497 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f00c884 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:02:34, skipping insertion in model container [2020-07-21 14:02:34,497 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.07 02:02:34" (2/3) ... [2020-07-21 14:02:34,497 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1f00c884 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.07 02:02:34, skipping insertion in model container [2020-07-21 14:02:34,498 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.07 02:02:34" (3/3) ... [2020-07-21 14:02:34,499 INFO L109 eAbstractionObserver]: Analyzing ICFG simple_4-2.c [2020-07-21 14:02:34,511 INFO L157 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBPonlyIfFpWasNotPerfect Determinization: PREDICATE_ABSTRACTION [2020-07-21 14:02:34,518 INFO L169 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-07-21 14:02:34,531 INFO L251 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-07-21 14:02:34,554 INFO L375 AbstractCegarLoop]: Interprodecural is true [2020-07-21 14:02:34,554 INFO L376 AbstractCegarLoop]: Hoare is true [2020-07-21 14:02:34,554 INFO L377 AbstractCegarLoop]: Compute interpolants for FPandBPonlyIfFpWasNotPerfect [2020-07-21 14:02:34,554 INFO L378 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-07-21 14:02:34,554 INFO L379 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-07-21 14:02:34,555 INFO L380 AbstractCegarLoop]: Difference is false [2020-07-21 14:02:34,555 INFO L381 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-07-21 14:02:34,555 INFO L385 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-07-21 14:02:34,572 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states. [2020-07-21 14:02:34,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2020-07-21 14:02:34,579 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:34,580 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:34,580 INFO L427 AbstractCegarLoop]: === Iteration 1 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:34,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:34,586 INFO L82 PathProgramCache]: Analyzing trace with hash 1846144830, now seen corresponding path program 1 times [2020-07-21 14:02:34,593 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:34,594 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [108747386] [2020-07-21 14:02:34,594 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 2 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:34,671 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:02:34,672 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:02:34,674 INFO L263 TraceCheckSpWp]: Trace formula consists of 22 conjuncts, 3 conjunts are in the unsatisfiable core [2020-07-21 14:02:34,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:02:34,743 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:02:34,743 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2020-07-21 14:02:34,745 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [108747386] [2020-07-21 14:02:34,746 INFO L220 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-07-21 14:02:34,746 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2020-07-21 14:02:34,748 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [940978158] [2020-07-21 14:02:34,754 INFO L459 AbstractCegarLoop]: Interpolant automaton has 3 states [2020-07-21 14:02:34,755 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:02:34,774 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2020-07-21 14:02:34,775 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 14:02:34,779 INFO L87 Difference]: Start difference. First operand 17 states. Second operand 3 states. [2020-07-21 14:02:34,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:02:34,819 INFO L93 Difference]: Finished difference Result 29 states and 34 transitions. [2020-07-21 14:02:34,821 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2020-07-21 14:02:34,822 INFO L78 Accepts]: Start accepts. Automaton has 3 states. Word has length 10 [2020-07-21 14:02:34,823 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:02:34,832 INFO L225 Difference]: With dead ends: 29 [2020-07-21 14:02:34,832 INFO L226 Difference]: Without dead ends: 12 [2020-07-21 14:02:34,836 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2020-07-21 14:02:34,856 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2020-07-21 14:02:34,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2020-07-21 14:02:34,885 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 12 states. [2020-07-21 14:02:34,888 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 12 transitions. [2020-07-21 14:02:34,890 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 12 transitions. Word has length 10 [2020-07-21 14:02:34,891 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:02:34,891 INFO L479 AbstractCegarLoop]: Abstraction has 12 states and 12 transitions. [2020-07-21 14:02:34,892 INFO L480 AbstractCegarLoop]: Interpolant automaton has 3 states. [2020-07-21 14:02:34,892 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 12 transitions. [2020-07-21 14:02:34,893 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2020-07-21 14:02:34,894 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:34,894 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:35,108 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:35,108 INFO L427 AbstractCegarLoop]: === Iteration 2 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:35,109 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:35,109 INFO L82 PathProgramCache]: Analyzing trace with hash 1432376145, now seen corresponding path program 1 times [2020-07-21 14:02:35,109 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:35,110 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1819629861] [2020-07-21 14:02:35,110 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 3 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:35,140 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:02:35,141 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:02:35,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 25 conjuncts, 5 conjunts are in the unsatisfiable core [2020-07-21 14:02:35,144 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:02:35,178 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:02:35,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:02:35,245 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:02:35,246 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1819629861] [2020-07-21 14:02:35,246 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:02:35,247 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 6 [2020-07-21 14:02:35,247 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1148414524] [2020-07-21 14:02:35,249 INFO L459 AbstractCegarLoop]: Interpolant automaton has 6 states [2020-07-21 14:02:35,249 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:02:35,249 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2020-07-21 14:02:35,250 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2020-07-21 14:02:35,250 INFO L87 Difference]: Start difference. First operand 12 states and 12 transitions. Second operand 6 states. [2020-07-21 14:02:35,322 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:02:35,323 INFO L93 Difference]: Finished difference Result 20 states and 22 transitions. [2020-07-21 14:02:35,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2020-07-21 14:02:35,324 INFO L78 Accepts]: Start accepts. Automaton has 6 states. Word has length 11 [2020-07-21 14:02:35,325 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:02:35,325 INFO L225 Difference]: With dead ends: 20 [2020-07-21 14:02:35,325 INFO L226 Difference]: Without dead ends: 15 [2020-07-21 14:02:35,327 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=19, Invalid=23, Unknown=0, NotChecked=0, Total=42 [2020-07-21 14:02:35,328 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2020-07-21 14:02:35,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2020-07-21 14:02:35,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 15 states. [2020-07-21 14:02:35,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2020-07-21 14:02:35,336 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 11 [2020-07-21 14:02:35,337 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:02:35,337 INFO L479 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2020-07-21 14:02:35,337 INFO L480 AbstractCegarLoop]: Interpolant automaton has 6 states. [2020-07-21 14:02:35,337 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2020-07-21 14:02:35,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2020-07-21 14:02:35,339 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:35,340 INFO L422 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:35,554 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:35,556 INFO L427 AbstractCegarLoop]: === Iteration 3 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:35,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:35,557 INFO L82 PathProgramCache]: Analyzing trace with hash -1031021570, now seen corresponding path program 2 times [2020-07-21 14:02:35,559 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:35,559 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1603135883] [2020-07-21 14:02:35,560 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 4 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:35,629 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:02:35,630 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:02:35,632 INFO L263 TraceCheckSpWp]: Trace formula consists of 34 conjuncts, 11 conjunts are in the unsatisfiable core [2020-07-21 14:02:35,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:02:35,681 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:02:35,681 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:02:35,804 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:02:35,805 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1603135883] [2020-07-21 14:02:35,805 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:02:35,806 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 12 [2020-07-21 14:02:35,806 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813291182] [2020-07-21 14:02:35,807 INFO L459 AbstractCegarLoop]: Interpolant automaton has 12 states [2020-07-21 14:02:35,807 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:02:35,808 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2020-07-21 14:02:35,808 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=86, Unknown=0, NotChecked=0, Total=132 [2020-07-21 14:02:35,809 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand 12 states. [2020-07-21 14:02:36,013 WARN L193 SmtUtils]: Spent 117.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2020-07-21 14:02:36,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:02:36,235 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2020-07-21 14:02:36,236 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2020-07-21 14:02:36,236 INFO L78 Accepts]: Start accepts. Automaton has 12 states. Word has length 14 [2020-07-21 14:02:36,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:02:36,237 INFO L225 Difference]: With dead ends: 26 [2020-07-21 14:02:36,237 INFO L226 Difference]: Without dead ends: 21 [2020-07-21 14:02:36,239 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=106, Invalid=166, Unknown=0, NotChecked=0, Total=272 [2020-07-21 14:02:36,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2020-07-21 14:02:36,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2020-07-21 14:02:36,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 21 states. [2020-07-21 14:02:36,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 21 transitions. [2020-07-21 14:02:36,247 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 21 transitions. Word has length 14 [2020-07-21 14:02:36,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:02:36,247 INFO L479 AbstractCegarLoop]: Abstraction has 21 states and 21 transitions. [2020-07-21 14:02:36,248 INFO L480 AbstractCegarLoop]: Interpolant automaton has 12 states. [2020-07-21 14:02:36,248 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 21 transitions. [2020-07-21 14:02:36,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2020-07-21 14:02:36,249 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:02:36,249 INFO L422 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:02:36,453 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:02:36,454 INFO L427 AbstractCegarLoop]: === Iteration 4 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:02:36,455 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:02:36,455 INFO L82 PathProgramCache]: Analyzing trace with hash -1348629730, now seen corresponding path program 3 times [2020-07-21 14:02:36,456 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:02:36,456 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [61848928] [2020-07-21 14:02:36,457 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 5 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:08:58,515 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:08:58,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:08:58,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 23 conjunts are in the unsatisfiable core [2020-07-21 14:08:58,527 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:08:58,674 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:08:58,674 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:08:59,153 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:08:59,154 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [61848928] [2020-07-21 14:08:59,154 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:08:59,155 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 24 [2020-07-21 14:08:59,155 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150043311] [2020-07-21 14:08:59,157 INFO L459 AbstractCegarLoop]: Interpolant automaton has 24 states [2020-07-21 14:08:59,159 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:08:59,160 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2020-07-21 14:08:59,161 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=386, Unknown=0, NotChecked=0, Total=552 [2020-07-21 14:08:59,162 INFO L87 Difference]: Start difference. First operand 21 states and 21 transitions. Second operand 24 states. [2020-07-21 14:09:10,677 WARN L193 SmtUtils]: Spent 11.20 s on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 14:09:12,256 WARN L193 SmtUtils]: Spent 1.42 s on a formula simplification that was a NOOP. DAG size: 51 [2020-07-21 14:09:15,034 WARN L193 SmtUtils]: Spent 2.63 s on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 14:09:18,927 WARN L193 SmtUtils]: Spent 3.78 s on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 14:09:21,180 WARN L193 SmtUtils]: Spent 2.11 s on a formula simplification that was a NOOP. DAG size: 36 [2020-07-21 14:09:22,482 WARN L193 SmtUtils]: Spent 318.00 ms on a formula simplification that was a NOOP. DAG size: 26 [2020-07-21 14:09:31,108 WARN L193 SmtUtils]: Spent 8.25 s on a formula simplification that was a NOOP. DAG size: 53 [2020-07-21 14:09:31,110 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:09:31,110 INFO L93 Difference]: Finished difference Result 38 states and 49 transitions. [2020-07-21 14:09:31,110 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2020-07-21 14:09:31,111 INFO L78 Accepts]: Start accepts. Automaton has 24 states. Word has length 20 [2020-07-21 14:09:31,111 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:09:31,112 INFO L225 Difference]: With dead ends: 38 [2020-07-21 14:09:31,112 INFO L226 Difference]: Without dead ends: 33 [2020-07-21 14:09:31,113 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 55 ImplicationChecksByTransitivity, 32.1s TimeCoverageRelationStatistics Valid=430, Invalid=760, Unknown=0, NotChecked=0, Total=1190 [2020-07-21 14:09:31,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2020-07-21 14:09:31,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2020-07-21 14:09:31,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 33 states. [2020-07-21 14:09:31,120 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 33 transitions. [2020-07-21 14:09:31,121 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 33 transitions. Word has length 20 [2020-07-21 14:09:31,121 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:09:31,121 INFO L479 AbstractCegarLoop]: Abstraction has 33 states and 33 transitions. [2020-07-21 14:09:31,121 INFO L480 AbstractCegarLoop]: Interpolant automaton has 24 states. [2020-07-21 14:09:31,121 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 33 transitions. [2020-07-21 14:09:31,122 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2020-07-21 14:09:31,123 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:09:31,123 INFO L422 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:09:31,329 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:31,330 INFO L427 AbstractCegarLoop]: === Iteration 5 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:09:31,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:09:31,331 INFO L82 PathProgramCache]: Analyzing trace with hash 144400734, now seen corresponding path program 4 times [2020-07-21 14:09:31,331 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:09:31,332 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [660949086] [2020-07-21 14:09:31,332 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 6 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:09:31,388 INFO L228 tOrderPrioritization]: Assert order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) issued 2 check-sat command(s) [2020-07-21 14:09:31,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2020-07-21 14:09:31,390 WARN L261 TraceCheckSpWp]: Trace formula consists of 88 conjuncts, 47 conjunts are in the unsatisfiable core [2020-07-21 14:09:31,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2020-07-21 14:09:31,744 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:09:31,745 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2020-07-21 14:09:33,186 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-07-21 14:09:33,187 INFO L354 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [660949086] [2020-07-21 14:09:33,187 INFO L220 FreeRefinementEngine]: Constructing automaton from 0 perfect and 2 imperfect interpolant sequences. [2020-07-21 14:09:33,187 INFO L233 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 48 [2020-07-21 14:09:33,187 INFO L156 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1282362010] [2020-07-21 14:09:33,188 INFO L459 AbstractCegarLoop]: Interpolant automaton has 48 states [2020-07-21 14:09:33,188 INFO L143 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-07-21 14:09:33,189 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2020-07-21 14:09:33,190 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=622, Invalid=1634, Unknown=0, NotChecked=0, Total=2256 [2020-07-21 14:09:33,190 INFO L87 Difference]: Start difference. First operand 33 states and 33 transitions. Second operand 48 states. [2020-07-21 14:09:35,643 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (+ c_main_~x~0 4294967280) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967276) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967254) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967268) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967294) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967292) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967258) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967290) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967272) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967264) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967260) 4294967296)) (< 0 (mod c_main_~x~0 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967288) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967284) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967274) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967278) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967262) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967256) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967286) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967282) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967266) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967252) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967270) 4294967296))) is different from false [2020-07-21 14:09:37,750 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (+ c_main_~x~0 4294967280) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967276) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967254) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967268) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967294) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967292) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967258) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967290) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967272) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967264) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967260) 4294967296)) (< 0 (mod c_main_~x~0 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967288) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967284) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967274) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967278) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967262) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967256) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967286) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967282) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967266) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967270) 4294967296))) is different from false [2020-07-21 14:09:39,768 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (+ c_main_~x~0 4294967280) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967276) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967268) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967294) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967292) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967258) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967290) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967272) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967264) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967260) 4294967296)) (< 0 (mod c_main_~x~0 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967288) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967284) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967274) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967278) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967262) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967256) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967286) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967282) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967266) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967270) 4294967296))) is different from false [2020-07-21 14:09:41,773 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (+ c_main_~x~0 4294967280) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967276) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967268) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967294) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967292) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967258) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967290) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967272) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967264) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967260) 4294967296)) (< 0 (mod c_main_~x~0 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967288) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967284) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967274) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967278) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967262) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967286) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967282) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967266) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967270) 4294967296))) is different from false [2020-07-21 14:10:30,340 WARN L193 SmtUtils]: Spent 44.09 s on a formula simplification that was a NOOP. DAG size: 96 [2020-07-21 14:10:36,557 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (+ c_main_~x~0 4294967280) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967276) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967268) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967294) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967292) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967290) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967272) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967264) 4294967296)) (< 0 (mod c_main_~x~0 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967288) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967284) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967274) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967278) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967262) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967286) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967282) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967266) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967270) 4294967296))) is different from false [2020-07-21 14:10:38,566 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (+ c_main_~x~0 4294967280) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967276) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967268) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967294) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967292) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967290) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967272) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967264) 4294967296)) (< 0 (mod c_main_~x~0 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967288) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967284) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967274) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967278) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967286) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967282) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967266) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967270) 4294967296))) is different from false [2020-07-21 14:10:40,578 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (+ c_main_~x~0 4294967280) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967276) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967268) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967294) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967292) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967290) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967272) 4294967296)) (< 0 (mod c_main_~x~0 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967288) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967284) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967274) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967278) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967286) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967282) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967266) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967270) 4294967296))) is different from false [2020-07-21 14:10:42,595 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (+ c_main_~x~0 4294967280) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967276) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967268) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967294) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967292) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967290) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967272) 4294967296)) (< 0 (mod c_main_~x~0 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967288) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967284) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967274) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967278) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967286) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967282) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967270) 4294967296))) is different from false [2020-07-21 14:10:44,610 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (+ c_main_~x~0 4294967280) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967276) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967294) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967292) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967290) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967272) 4294967296)) (< 0 (mod c_main_~x~0 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967288) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967284) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967274) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967278) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967286) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967282) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967270) 4294967296))) is different from false [2020-07-21 14:10:46,664 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (+ c_main_~x~0 4294967280) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967276) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967294) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967292) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967290) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967272) 4294967296)) (< 0 (mod c_main_~x~0 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967288) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967284) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967274) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967278) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967286) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967282) 4294967296))) is different from false [2020-07-21 14:10:59,124 WARN L193 SmtUtils]: Spent 9.67 s on a formula simplification that was a NOOP. DAG size: 61 [2020-07-21 14:11:08,912 WARN L193 SmtUtils]: Spent 5.98 s on a formula simplification that was a NOOP. DAG size: 56 [2020-07-21 14:11:10,995 WARN L838 $PredicateComparison]: unable to prove that (and (< 0 (mod (+ c_main_~x~0 4294967290) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967280) 4294967296)) (< 0 (mod c_main_~x~0 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967294) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967288) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967292) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967284) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967278) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967286) 4294967296)) (< 0 (mod (+ c_main_~x~0 4294967282) 4294967296))) is different from false [2020-07-21 14:11:15,627 WARN L193 SmtUtils]: Spent 3.71 s on a formula simplification that was a NOOP. DAG size: 46 [2020-07-21 14:11:17,391 WARN L193 SmtUtils]: Spent 1.38 s on a formula simplification that was a NOOP. DAG size: 41 [2020-07-21 14:12:27,333 WARN L193 SmtUtils]: Spent 1.08 m on a formula simplification that was a NOOP. DAG size: 113 [2020-07-21 14:12:27,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-07-21 14:12:27,338 INFO L93 Difference]: Finished difference Result 62 states and 85 transitions. [2020-07-21 14:12:27,338 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2020-07-21 14:12:27,338 INFO L78 Accepts]: Start accepts. Automaton has 48 states. Word has length 32 [2020-07-21 14:12:27,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-07-21 14:12:27,339 INFO L225 Difference]: With dead ends: 62 [2020-07-21 14:12:27,340 INFO L226 Difference]: Without dead ends: 57 [2020-07-21 14:12:27,342 INFO L675 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 69 ConstructedPredicates, 11 IntricatePredicates, 0 DeprecatedPredicates, 66 ImplicationChecksByTransitivity, 169.6s TimeCoverageRelationStatistics Valid=1107, Invalid=2465, Unknown=12, NotChecked=1386, Total=4970 [2020-07-21 14:12:27,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 57 states. [2020-07-21 14:12:27,355 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 57 to 57. [2020-07-21 14:12:27,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 57 states. [2020-07-21 14:12:27,356 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 57 transitions. [2020-07-21 14:12:27,357 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 57 transitions. Word has length 32 [2020-07-21 14:12:27,357 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-07-21 14:12:27,358 INFO L479 AbstractCegarLoop]: Abstraction has 57 states and 57 transitions. [2020-07-21 14:12:27,358 INFO L480 AbstractCegarLoop]: Interpolant automaton has 48 states. [2020-07-21 14:12:27,358 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 57 transitions. [2020-07-21 14:12:27,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2020-07-21 14:12:27,365 INFO L414 BasicCegarLoop]: Found error trace [2020-07-21 14:12:27,365 INFO L422 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-07-21 14:12:27,568 WARN L516 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2020-07-21 14:12:27,569 INFO L427 AbstractCegarLoop]: === Iteration 6 === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-07-21 14:12:27,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-07-21 14:12:27,569 INFO L82 PathProgramCache]: Analyzing trace with hash -726077986, now seen corresponding path program 5 times [2020-07-21 14:12:27,570 INFO L163 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-07-21 14:12:27,570 INFO L354 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1986659092] [2020-07-21 14:12:27,571 INFO L95 rtionOrderModulation]: Keeping assertion order SMT_FEATURE_HEURISTIC (partitioning type FIXED_NUM_PARTITIONS, 2 partitions) No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 7 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in